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Yes, A and T are always paired up together. When DNA replicated, adenine and thymine always pair up. However, it's been proven that there is a very very small percentage of extra C, meaning that C and G don't completely pair up because there is about a 0.8% more percentage of C than G. No scientist has been able to prove how or why, though.

Basically, A and T always pair up. Same with C and G, there is just a little bit more of C than G.

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15y ago

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Are there always going to be an equal number of adenine and thymine nucleotides an a molecule?

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